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net/dns, health: raise health warning for failing forwarded DNS queries (#12888)

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updates tailscale/corp#21823

Misconfigured, broken, or blocked DNS will often present as
"internet is broken'" to the end user.  This  plumbs the health tracker
into the dns manager and forwarder and adds a health warning
with a 5 second delay that is raised on failures in the forwarder and
lowered on successes.

Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>
This commit is contained in:
Jonathan Nobels
2024-07-29 13:48:46 -04:00
committed by GitHub
parent 3088c6105e
commit 19b0c8a024
7 changed files with 53 additions and 8 deletions
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5
net/dns/manager_tcp_test.go
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@@ -15,6 +15,7 @@ import (
"github.com/google/go-cmp/cmp"
dns "golang.org/x/net/dns/dnsmessage"
"tailscale.com/health"
"tailscale.com/net/netmon"
"tailscale.com/net/tsdial"
"tailscale.com/tstest"
@@ -88,7 +89,7 @@ func TestDNSOverTCP(t *testing.T) {
SearchDomains: fqdns("coffee.shop"),
},
}
m := NewManager(t.Logf, &f, nil, tsdial.NewDialer(netmon.NewStatic()), nil, nil, "")
m := NewManager(t.Logf, &f, new(health.Tracker), tsdial.NewDialer(netmon.NewStatic()), nil, nil, "")
m.resolver.TestOnlySetHook(f.SetResolver)
m.Set(Config{
Hosts: hosts(
@@ -173,7 +174,7 @@ func TestDNSOverTCP_TooLarge(t *testing.T) {
SearchDomains: fqdns("coffee.shop"),
},
}
m := NewManager(log, &f, nil, tsdial.NewDialer(netmon.NewStatic()), nil, nil, "")
m := NewManager(log, &f, new(health.Tracker), tsdial.NewDialer(netmon.NewStatic()), nil, nil, "")
m.resolver.TestOnlySetHook(f.SetResolver)
m.Set(Config{
Hosts: hosts("andrew.ts.com.", "1.2.3.4"),